package com.qk.filter;

import com.qk.utils.CurrentUserHoler;
import com.qk.utils.JwtUtils;
import io.jsonwebtoken.Claims;
import jakarta.servlet.*;
import jakarta.servlet.annotation.WebFilter;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import lombok.extern.slf4j.Slf4j;

import java.io.IOException;

@Slf4j
@WebFilter(urlPatterns = "/*")
public class TokenFilter  implements Filter {


    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;
        // 1. 获取请求路径
        String uri = request.getRequestURI();

        // 2. 判断请求路径是否为登录请求
        if (uri.contains("/login")) {
            log.info("登录请求:{}, 放行", uri);
            filterChain.doFilter(request, response);
            return;
        }

        // 3. 获取token
        String token = request.getHeader("token");

        // 4. 判断是否有token，如果没有响应401
        if (token == null || token.isEmpty()) {
            log.info("请求未携带token, 响应401");
            response.setStatus(401);
            return;
        }

        // 5. 解析token,如果Token不合法，响应401
        try {
            Claims claims = JwtUtils.parseToken(token);
            Integer userId = claims.get("id", Integer.class);
            log.info("当前用户id存入ThreadLocal");
            CurrentUserHoler.setCurrentUser(userId);

        } catch (Exception e) {
            log.info("token解析异常，响应401");
            response.setStatus(401);
            return;
        }
        // 6. 放行
        filterChain.doFilter(request, response);

        // 7.释放资源
        log.info("删除ThreadLocal中的用户登录信息");
        CurrentUserHoler.removeCurrentUser();
    }
}